Understanding Lumen and Kelvin numbers is essential for growing healthy seedlings for transplants. Lumens is the brightness or intensity of a bulb. You want a lumen number between 2000 and…Video Rating: 5 / 5

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

Understanding Lumen and Kelvin numbers is essential for growing healthy
seedlings for transplants. Lumens is the brightness or intensity of a bulb.
You want a lumen number between 2000 and 3000.

Kelvin is the color of the light. The higher the kelvin number the closer
it is to Natural Light. You want a kelvin number between 4100 and 6500.
Keep in mind you may not find the perfect bulb as they vary in
availability. However, there is a nice range that is effective for
germinating vegetable seeds and growing vegetable transplants.

This video came at an absolutely perfect time. I have been thinking about
starting seedlings indoors for the past two years and I think I may do it
this year. The information was absolutely great for someone like myself who
had no clue about what type of light is needed. Thank you for this video.﻿

Perfect time to me since I just started with tomatoes seeds in a mini
greenhouse but without grow lights. And I noticed only one tenth of seeds
germinated after two weeks time. Now I am going to try with grow lights and
see whether the number increases in germinating. ﻿

Very informative video. A month ago I decided to build my own DIY LED
grow-light. Something that isn’t being used that much yet. I had to do some
research about the specific colors and the right electronics. My Devil’s
tongue peppers are growing fine! If you’d like to know more about it, I
might try to shoot a video in my best Dutch-English I can ﻿

Gary the colour temperature of a light source is the temperature of an
ideal black-body radiator that radiates light of comparable hue to that of
the light source, so that the surface temperature of the emitter will
determine the wavelength of the light emitted. To the extent alight
bulb that a hot surface emits thermal radiation but is not an ideal
black-body radiator, the colour temperature of the light is not the actual
temperature of the surface. An incandescent lamp’s light is thermal
radiation, and the bulb approximates an ideal black-body radiator, so its
colour temperature is essentially the temperature of the filament.
Many other light sources, such as fluorescent lamps, or LEDs (light
emitting diodes) emit light primarily by processes other than thermal
radiation. This means that the emitted radiation does not follow the form
of a black-body spectrum. These sources are assigned what is known as a
correlated colour temperature (CCT). CCT is the colour temperature of a
black-body radiator which to human colour perception most closely matches
the light from the lamp. Because such an approximation is not required for
incandescent light, the CCT for an incandescent light is simply its
unadjusted temperature, derived from the comparison to a black-body
radiator. The colour temperature of natural l daylight is 5500-6000 K.﻿

I was looking the other day at the 4ft fluorescent light bulbs sold as
“plant and aquarium”. 1600 lumens, 2700 kelvin. At twice the price ($11
each), they seem to be outside the range. Is there a reason?

You mention that we should put the light fixture close to the plant,
especially if the light is “weak”. However, no matter how bright the light
(the lumen number) is, that intensity will fall off (decrease) as the
distance increase. In fact, a fixture twice as far away will give only 1/8
the amount of light; three times as far away means 1/27 the original
intensity reaches the plants. That’s because any source of radiation, like
light, drops at the cube of the distance.

So it’s a trade off between heat (which even florescents develop, albeit
less than halogens or incandescents) and the light it gives off. Put a hot
light too close to the plant and it will fry (bake is a more accurate term,
but not as colorful).

Power (Watts) consumed is directly proportional to the light output for any
type of light source. The more power, the hotter will be the light. But
heat, too, is a form of radiation, so it falls off by the cube of the
distance, just as light does. A fan will move air (and the heat in it) away
from the plants/seedlings and will displace that air with cooler air, if
needed.

Thanks for your videos. I have shared them with gardening friends for
years,and we have all benefited from your expertise.﻿

This was great information! I typically use my window sill and sunlight but
I am currently working on a project to grow my herbs in small decorative
boxes in the winter so this information was very helpful. I heard you
mention you use foil for the boxes? I ran across a link posted on another
thread (by Sleestaksrule) about reflective material and surprisingly, foil
was not recommended. You may find this interesting. Here is the link:http://www.rollitup.org/t/grow-room-qustion-mylar-panda-film-reflectix-foil-white-paint.237642/
It is info for grow rooms and not boxes, but it provides reflective
information which is what I need for my boxes. ﻿

Walmart carries (or carried) the Lights Of America brand of T8 fixtures. A
dual T8 used to be about $9.99 a few years ago and I think now it’s up to
$11 or so. I’d buy 2 fixtures and take the ballast out of one, combine
them in one fixture, and give each bulb it’s own ballast. You’ll get 5,000
lumen off each bulb but it will shorten the bulb life. I’d say replace
after 1 year of constant use every day. It’s enough light to grow small
tomato plants indoors like Tiny Tim or Red Robin. I love grow light videos
and this was well done.﻿